private static int Run(int concurrencyLevel, int x, int y, int z)
{
object _lock = new object();
int count_locks = 0;
var _locks = new lockItem[concurrencyLevel];
for (int i = 0; i < concurrencyLevel; i++)
{
_locks[i] = new lockItem();
}
Action <Guid> fnc = (g) =>
{
int lockNo = (g.GetHashCode() & 0x7fffffff) % concurrencyLevel;
var item = _locks[lockNo];
if (item.Count > 1)
{
count_locks++;
}
lock (_lock)
item.Count++;
Thread.Sleep(y);
lock (_lock)
item.Count--;
};
for (int i = 0; i < x; i++)
{
Task.Factory.StartNew(() => fnc(Guid.NewGuid()));
Thread.Sleep(z);
if (count_locks > 0)
{
return(i);
}
}
while (count_locks > 0)
{
Task.Yield();
}
return(0);
}
public void Concurrency_Keys_UnitTest1()
{
int concurrencyLevel = 1000;
var _locks = new lockItem[concurrencyLevel];
for (int i = 0; i < concurrencyLevel; i++)
{
_locks[i] = new lockItem();
}
for (int i = 0; i < concurrencyLevel; i++)
{
var key = Guid.NewGuid();
int hashcode = key.GetHashCode(); // and logic 0x7fffffff -> remove sign and result is positive
int lockNo = (hashcode & 0x7fffffff) % concurrencyLevel; // modulo -> find an integer less than array length
Assert.IsTrue(lockNo >= 0 && lockNo < concurrencyLevel); //
var item = _locks[lockNo];
item.Count++;
}
int count_unuseds = 0;
int count_locks = 0;
int max_locks = 0;
for (int lockNo = 0; lockNo < concurrencyLevel; lockNo++)
{
var item = _locks[lockNo];
max_locks = Math.Max(max_locks, item.Count);
if (item.Count == 0)
{
count_unuseds++;
}
else if (item.Count > 1)
{
count_locks++;
}
}
}